ABB RET620 5BTNAAAANDC1BNN21G
ABB RET620 5BTNAAAANDC1BNN21G
ABB RET620 5BTNAAAANDC1BNN21G
ABB RET620 5BTNAAAANDC1BNN21G

ABB RET620 5BTNAAAANDC1BNN21G | Relion 620 Series Feeder Protection Relay

  • Brand: ABB
  • Model: RET620 5BTNAAAANDC1BNN21G
  • Product Type: Numerical Protection Relay
  • Series: Relion 620 Series (ABB Power Protection Portfolio)
  • Core Function: Provides overcurrent, earth fault, sync check, and auxiliary protection for medium-voltage feeders; enables fault detection, isolation, and system restoration.
  • Key Specs: 110-240V AC/DC supply, 1A/5A nominal current input, IEC 61850/MODBUS communication, -20°C to +70°C operating temperature.
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Part number: ABB RET620 5BTNAAAANDC1BNN21G
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Description

RET620 5BTNAAAANDC1BNN21G: Product Overview
This device is a numerical protection relay within ABB’s Relion 620 Series, designed for medium-voltage feeder protection in transmission and distribution networks. In an electrical grid architecture, it functions as a critical component of the protection, instrumentation, and control (PIC) system, positioned at substations or feeder endpoints to monitor electrical parameters (voltage, current, phase angle) and execute protective actions. Its role is to detect abnormal conditions (e.g., short circuits, earth faults, overloads, loss of synchronism) and initiate rapid isolation of faulty sections to prevent equipment damage and minimize outage duration.
The core functionality involves sampling three-phase currents and voltages (via CTs/VTs), applying digital signal processing algorithms to calculate fault characteristics (e.g., impedance for distance protection, current magnitude for overcurrent), and comparing measured values against configurable thresholds. It supports multiple protection functions: phase overcurrent (51), earth fault (51N/67N), sync check (25), under/overvoltage (27/59), and under/overfrequency (81U/O). The relay also provides event recording (fault waveforms, sequence of events) and auxiliary contacts for remote status signaling.
It belongs to the Relion 620 Series, a product family optimized for modularity, interoperability, and compliance with global power standards. The platform’s benefits include a unified engineering tool (ABB PCM600) for configuration and diagnostics, adherence to IEC 60255 (protection relays) and IEC 61850 (communication), and backward compatibility with legacy ABB relays—enabling phased modernization of existing substations.

ABB RET620 5BTNAAAANDC1BNN21G

ABB RET620 5BTNAAAANDC1BNN21G

RET620 5BTNAAAANDC1BNN21G: Technical Specifications
  • Model Number: RET620 5BTNAAAANDC1BNN21G
  • Manufacturer: ABB
  • Product Type: Numerical Protection Relay
  • Protection Functions: Phase Overcurrent (51), Earth Fault (51N/67N), Sync Check (25), Under/Overvoltage (27/59), Under/Overfrequency (81U/O), Directional Power (32)
  • Nominal Current Input: 1A or 5A (configurable, via CT secondary)
  • Nominal Voltage Input: 110-240V AC/DC (dual-rated supply)
  • Communication Protocols: IEC 61850 (Edition 2), MODBUS RTU/TCP, DNP3
  • Event Recording: 2048 events, 16 fault records (waveforms up to 128 samples/cycle)
  • Operating Temperature: -20°C to +70°C
  • Storage Temperature: -40°C to +85°C
  • Enclosure Rating: IP52 (front panel), IP20 (rear)
  • Dimensions: 225mm x 165mm x 85mm (WxHxD, panel-mount)
  • Weight: 1.8kg
Core Features & Customer Value​
The relay’s design prioritizes protection accuracy, system coordination, and operational efficiency. Multi-function protection (overcurrent, earth fault, sync check) eliminates the need for multiple single-purpose relays, reducing panel space and wiring complexity—critical for compact substation designs. For example, its directional earth fault (67N) element uses voltage polarization to distinguish fault direction in meshed networks, ensuring selective tripping of only the faulty feeder.
IEC 61850 communication support streamlines integration with modern substation automation systems (SAS), enabling peer-to-peer GOOSE messaging for fast interlocking (e.g., breaker failure protection). This reduces reliance on hardwired interconnections, cutting installation costs by 15-20%. MODBUS RTU/TCP and DNP3 protocols ensure compatibility with legacy SCADA systems, easing phased upgrades.
Event recording (16 fault records with 128 samples/cycle) provides high-resolution post-fault analysis data, helping engineers identify root causes (e.g., lightning-induced surges, insulation breakdown). For maintenance teams, this reduces diagnostic time from hours to minutes. The PCM600 engineering tool simplifies configuration: engineers define protection settings, logic equations, and communication parameters via a graphical interface, with built-in validation checks to prevent misconfigurations.

ABB RET620 5BTNAAAANDC1BNN21G

Typical Applications​
In a 69kV distribution substation, the relay protects a feeder serving an industrial park. Its phase overcurrent (51) and earth fault (51N) elements detect short circuits and ground faults, while sync check (25) prevents non-synchronous closing of the breaker during grid reconnection. IEC 61850 GOOSE messages coordinate with upstream 138kV substation relays, ensuring system-wide selectivity.
At a wind farm’s collector substation, it safeguards the feeder connecting turbines to the grid. Directional power (32) and underfrequency (81U) elements trip the feeder during grid disturbances, maintaining plant stability. Event recordings help analyze intermittent faults caused by turbine switching transients.
In a rural distribution network with long radial feeders, the relay’s adjustable time-delay coordination with downstream reclosers prevents unnecessary outages during transient faults (e.g., tree contact). The -20°C to +70°C operating range withstands unheated shelter temperatures.

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